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(N0 Model.) V 2 Sheets-Sheet 1.

' H. A. BRADLEY.

GOAL DUST FEEDER.

No. 295.145. Patented Mar. 18, 1884.

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- 2 Sheets-Sheet 2.

(No Modei.)

' H. A. BRADLEY. GOAL DUST FEEDER. No. 295,145. Patented Mar. 18, 1884.

FFICEQ PATENT HENRY A. BRADLEY, OF NET/V YORK, N. Y.

COAL-DUST FEEDER.

SPECIFICATION forming part of Letters Patent No. 295,145, dated March18, 1884.

Application filed July 14, 1883. (No model.) K

To all whom it'mal concern:

Be it known that I, HENRY A. BRADLEY, of New York, in the county andState of New York, have invented a new and Improved CoaLDust Feeder, ofwhich the following is a specification.

In the drawings, Figure 1 represents a sectional side view of myimproved c0al dust feeder. Figs. 2 and 3 are sectional views ofmodifications of the some.

This invention has for its object the production of a device which willfeed coal-dust in the presence of steam to a flame, and utilize thecoal-dust in its original form, together with the steam, for purposes ofheating steamboilers and the like.

The invention consists in the new combina tion of parts which constitutethe feeder, as hereinafter more fully specified.

In Fig. l of the drawings, the letter A represents the coal-dustsupply-pipe, which dips into the pile of dust at a suitable distancefrom the body of the" feeder, and which con tains a suitable cock, B, bywhich the size of the channel through which the coal dust passes to thefeeder may be regulated. The

end of the pipe A, which is nearest the feeder,

is screwed or otherwise fastened in a cylindrical piece, 0, which issurrounded by a chamber, a, into which a steam-pipe, D, en-- tors. Thechamber a is of annular form. It may, at its lower part, be providedwith a drip-poclret, b, from which the drippings may escape through a.short pipe, E, having a cock, (Z. The end of the pipe A within thecylindrical piece G is partly closed by a cap or plate, j, through whichapertures g g extend into a chamber, h. This chamber it communicatesalso with the annular chamber a by apertures The outer or face plate, j,of the chambers It has series of perforations'l 1. Each of theseperforations Z-is by preference in the range of a passage, and of apassage,

' t, as indicated by the dotted lines in Fig. 1.

- will rush into the chamber a, and thence through the apertures intothe chamber 71, whence it will escape through the apertures Z. Duringthis passage the steam will create suction in the apertures g. and causea supply of coal-dust to be drawn through the pipe A and through saidapertures g into the chamber h, and thence out through the apertures Zto the flame. The apertures g being aligned with the apertures Z, asshown, will cause the coal-dust to pass out in a straight line from thepipe A to and through the apertures Z, and will prevent the retention ofdust in the chamber h. It is desirable that the number of apertures 9should correspond with the number of apertures and Z, and that the saidapertures be relatively arranged in the position indicated in thedrawings.

Instead of passing the coal-dust through the pipe A into the cylindricalpiece 0, and thence out through the head f, it may, as in Fig. 2, becarried by the pipe or pipes A through the chamber a to the partition1), which separates the chamber a from the chamher it, the saidpartition having in this case the apertures g. This leaves a centralpassage, 0., in the cylindical piece 0, open at both ends, for supplyinga charge of oxygen to the flame. Another modification, shown in Fig. 3,consists in conveying the coal-dust by the pipe or pipes A directly intothe chamber 71, thereby forming the inletopeuings g in the rim a of vthe chamber 71.

I claim-.-

1. In a coal-dust feeder, the combination of the pipe A, with thecylindrical piece C,chamher or, having apertures i, pipe D, head f,having apertures g, chamber h, cap 3', having apertures Z, all arrangedwith reference to each other, substantially as herein shown and de.scribed.

2- The Goal-dust. feeder constructed with chamber a, and steamsupplypipe D, leading thereto, and with the chamber 11, having apertures g forreceiving coal-dust, apertures 1- for receiving steam, and apertures Zfor the discharge of the mixed steam and coal-dust, substantially asherein shown and described.

HENRY A. BRADLEY Vitnesses:

WILLY G. E. ScHUL'rz, J nuns TURK.

